WITH t AS
(
SELECT 1322049461 a FROM dual
UNION ALL
SELECT  1322041123    FROM dual
UNION ALL
SELECT  1322049461 FROM dual
)
--9i
SELECT max(substr(sys_connect_by_path(a,','),2)) b
FROM 
       (SELECT a,row_number() over(ORDER by a) rn FROM t)
 START WITH rn=1 CONNECT BY rn-1=PRIOR rn

--10g
select wm_concat(a,',') from t